DescriptionUrysohn.jpeg English: Pavel Urysohn, Russian mathematician Русский: Павел Самуилович Урысон — советский математик. Date late 19th/early 20th
DescriptionUrysohn-Différentiel-(1).jpg English: First illustration for Urysohn's lemma proof (differential case) (1). Français : Illustraition de la démonstration
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